PHP - Trying To Include A Php File From Within A Static Class Function

I write for example class Text:


class Text {
    public static function test() {
        return 'test text';
    }
}


Today I found this code:


class Text {
     
      /** 
       * Protected constructor since this is a static class.
       *
       * @access  protected
       */  
    protected function __construct(){
        // Nothing here
    }

    public static function test() {
        return 'test text';
    }
}


How much appropriate is to write this?


    /** 
       * Protected constructor since this is a static class.
       *
       * @access  protected
       */  
    protected function __construct(){
        // Nothing here
    }

heres an example of the code i have
Code: [Select]
class someclass
{

public function run($parm)
{
system($parm);
}

public static function create($item1,$item2)
{
$this->run($item1 . $item2);
}

}

then i have a file that attempts to use the create method:
someclass::create($one,$two);

when interpreting, i get this error: "Using $this when not in object context in"

does anyone know how I can fix this? I think I understand why its wrong (the class hasn't really been set up) - I just dont know how to correct it. Is there a way I can access class functions without using $this ? additionally I tried making the run method static too, but that didnt seem to work.

Is it ok to do this?
Code: [Select]
class Two {

 function anything() {
   classOne::anyMethod();
 }

}

I'm sure it is but this doesn't pose very well for if I wanted to swop out one class for another. I'd then have to make changes to the code (unless I were sure all classes were named the same).

--

What I want it for (and this may be another issue), is this:

I may need to create more than one database instance:
Code: [Select]
//Database exends mysqli
$db[1] = new Database(2);//database 2 used this time
$db[2] = new Database(5);//db5

I then always use Database::closeAll() at any point in my script to ensure all connections are closed. Of course $this->close wouldn't close all instances/connections, just the one I was working on.

I know I don;t have to close all connections, but I may as well, and there are other occasions where the first part of this question applies, so please don't just respond "no need to close".

Database::closeAll() is this:
Code: [Select]
public static function closeAll() {

//closes ALL active instances (not just this one)

global $db;

foreach($db as $v) {

$db[$v]->close(); unset($db[$v]);

}
        }

Hello, my first post here.

I created a Validation class that depends entirely on static methods. It appears to be working well, but perhaps I misunderstood exactly the purpose and the consequences of using static methods.

My class essentially looks like this:


class Validate
{
static public $errors  = array();
static public $valid   = array();

static public function Name($name)
{
if ($name != '')
{
self::$valid['name'] = $name;
return true;
}
                                else
                                {
                self::$errors['name'] = 'Name is empty';
                return false;
                                 }
}
}


Does this create any chance whatsoever for a collision of data from multiple users? I am beginning to think it does, simply because from what I have recently learned about static methods, theyr'e essentially global variables because they are not instantiated. If that's the case, then it would seem possible that during times of heavy use, any application depending on this class would confuse submitted data.

Any thoughts?

Thanks in advance.

I have the following simple class:

Code: [Select]
class Settings {
  public static $mysql_datetime_format = "%c/%e/%Y %l:%i %p " . date("[T]");
}

And referencing like:

Code: [Select]
echo Settings::$mysql_datetime_format;

But, I am getting the error: Parse error: syntax error, unexpected '.', expecting ',' or ';'.

Why is this invalid?

Question 1) Is the only and proper way to call a parent function "parent::function()"?  Are there other/better ways from within a child function?

Question 2) What are the deciding factors for when to make a function or attribute static?  How do you make that decision?  Assuming 5.3...

Thanks.

Was just wondering why some people choose NOT to make use of static functions when initializing objects via Factory Classes/Containers.

What are the benefits of initializing the Factory class when for all intensive purposes, it's only used to initialize new classes, etc? 
Does this have any impact on Dependency Injection?  I'm assuming that it doesn't since that would defeat the purpose.

---------

Also, I've noticed that there seems to be an intense stigma within the development community in regard to singletons. 
Are singletons necessarily a bad thing? 

What about database objects? 

One argument I've heard is that this can often impact the flexibility of your application in the event that a new instance of said class needs to be initialized(a second completely separate connection).

However, I was thinking that you could simply store these objects within a static member variable in the factory class; leaving the Database Class' __construct public in the event that you need to create that second/third/fourth connection.

Wouldn't this resolve the issue? 

Hi guys, I am trying something fairly simple but I'm not sure if this would be a good practice. Basically I am using a big class called CommonLibrary that holds common functions as methods and common variables as static variables. But I have some variables here and there like $allAlphabet = range ('a' , 'z'), that cannot be declared as a property because it gives me a parse error.

I don't want to call an object for this class because instancing it is of no use. Values will never change with regards to instances. So the next best thing that I tried was declaring all static variables first, and then changing thei property values inside the class __construct with self::$variable = 'somevalue', and then using this code below to assign values to the empty static variables.


$dummyObject = new CommonLibrary;
unset($dummyObject);
echo CommonLibrary::$staticVariable; // This property is NULL before the constructer is triggered.


Anyone recommend any better ways of doing this?

Thanks in advance!

I have the following static method:
public static function query($query){
self::$num_queries++;
return mysql_query($query)or die(mysql_error());
}

I then call it like this:
$oql = Mysql::query("SELECT first FROM members WHERE member_id = '{$this->owner}'");
$rql = mysql_fetch_assoc($oql);

I then get the following error:
Quote

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /incl/php/classes/Photo.php on line 13


Why am I getting this error?

Hi!

I have a class with many functions/methods. I want to split this into different files so I can easily edit and add functions.
I want every functions to be able to call eachother and with that I mean, they have to be for example in same document.

My question is: I can't have a class and include functions like this:

Code: [Select]
class DB
{

include('select_functions.php'); //Only includes function's no class
include('insert_functions.php'); //Only includes function's no class
include('delete_functions.php'); //Only includes function's no class

function test()
{

}

}
The includes will output fatal errors...

How can I solve this so I can have all functions in different files but still use ONE object to call them!

Thanks!

I am trying to write a more elegant solution to be able to check an object, find only the properties in an object that have values, and update those values in a database with a matching ID.

I am extending a class from a generic user class here is an example of my code


Code: [Select]
<?php
require_once('User.php');

require_once('Database.php');



class Vendor extends User {


protected static $vendor_attributes = array('id', 'nothing' , 'tagline' , 'bio');
protected static $table_name = "user_vendors";

public $tagline;




















}//close class


?>

Hi,
I have been trying to improve my PHP programming skills by following the Lynda.com Beyond the basics tutorial and they came to a section where they were building common database methods inside a database class.

Since they did not have PHP 5.3 (Where late static bindings is introduced) they had to place code referring to self:: inside of each class that needs this functionality. It seems that not having late static binding was binding self to the database class and not to other classes that call it statically. I will insert some code to explain this better.

Long story short, I was really interesting in getting an attributes function working and as I do not have late static bindg either, I cannot figure out how to call it from inside a class to make it function correctly.

Here is some code. Below is the attribute class they wrote. Each class declared an array of attributes for each of the classes that want to call this method like

protected static $db_fields = array('id', 'email', 'password', 'etc');

Code: [Select]

        protected function attributes() {
        // return an array of attribute names and their values
  $attributes = array();
  foreach(self::$db_fields as $field) {
    if(property_exists($this, $field)) {
      $attributes[$field] = $this->$field;
    }
  }
  return $attributes;
}
They planned on moving this code to a DatabaseObject class after they get LSB but until then, have to include it in every class that wants use this.

Is there any way to write this as a function, include it in a class, and call the method without late static binding.. or even place this inside a database class and call it from another class without LSB?

Forgive me if I am not explaining this correctly, again, I am still learning.

My version of PHP is 5.2.6.

Ok, my php skills are such that I can customize an existing script to some extend, but I can't write one.

My problem is the following:
I'm using a php-based forum script in a friends website. I load the 'forum.php' script  in an iframe of a static page.

When a user gets a response to a post that he wrote on the forum, he receives a mail with a link which - if clicked - gets him to the response he got ie. http://someurl.com/forum.php?todo=viewtopic&tid=6#t2

The problem is now that if he clicks the link, the file of course doesn't open in the iframe of the static page (http://someurl.com/forum.html) where normally this forum.php file opens.

I guess I will have to make the static page also into a php-file and then use parts of the clicked url (forum.php?todo=viewtopic&tid=6#t2) and insert it into the iframe as the file to load ... would appreciate a lot if anyone can advice me how to do that!

Thanks in advance,
K.

Using PHP Version 5.2.13
My question: How do I access a class and it's methods from an included file?

I have an Index.php page that calls two methods:
<?php get_header(); ?>
<?php get_footer(); ?>

and it creates a class in an include file
<?php include_once($_SERVER['DOCUMENT_ROOT'].'/includes/common.html');?>
   $site = new WebSite($site_name); // Creates a bunch of properties, defines some methods, etc...
              $site->initialize();

<?php get_header(); ?> ends up including a another file (header.php)
<?php get_header(); ?> ends up including a another file (footer.php)

All calls in Index.php to methods in my class work. ie <?php $site->display_section('column'); ?>
But calls in either the header.php or footer.php to methods in my class fail with "Call to a member function is not an object".
I understand what the error means but I don't understand why. I thought all functions and classes defined in an include file have global scope. As per PHP.NET's documentation:

"When a file is included, the code it contains inherits the variable scope of the line on which the include occurs. Any variables available at that line in the calling file will be available within the called file, from that point forward. However, all functions and classes defined in the included file have the global scope."

The include that creates the class is something that I have inherited from another developer and I actually can't change the scope. I've tried with global $site = new WebSite($site_name);. It actually breaks the entire site.

How can I access classes, properties, methods in an include file?

Any help would be appreciated. I've been racking my head for several days now on it and it's probably some newbie thing that I am completely overlooking. I hope I've provided enough background and info.

Thanks,

Brian

I been wondering how to protect all the files that contain classes, functions and forms in php to prevent direct access to something that the user shouldnt be able to without the proper check's (typing http://server/inc/login.php insteand of http://server/), and i came to this small idea of checking if an object is set or not but i m wondering if this is really the best idea here's what i have (the case bellow will protect an login form to be accessed directly):

Code: [Select]
<?php
    if(!isset($mysqlobj)) die();
    if( isset( $_POST['username'] ) && isset( $_POST['password'] ) ){
        $login = authentication::login( $_POST['username'], $_POST['password'] );
        if( $login == true ){
            header( 'location:?go=home' );
        }else{
            $_SESSION['message'] = 'loginfailed';
            header( 'location:?go=login' );
        }
    }else{
      if( !empty($_SESSION['logged'] ) && $_SESSION['logged'] == true ){
          header( 'location:?go=home' );
      }else{
          ?>
            <div id="loginform">
                <form action="?go=login" method="post">
                    <table align="center">
                        <tr>
                            <td><font size="2">Username</font></td>
                            <td><input type="text" name="username" /></td>
                        </tr>
                        <tr>
                            <td><font size="2">Password</font></td>
                            <td><input type="password" name="password" /></td>
                        </tr>
                        <tr>
                            <td colspan="2" align="center"><input type="submit" value="Login" /></td>
                        </tr>
                    </table>
                </form>
                </div>               
          <?php
      }   
    }
?>

Just looking for an "best practice" i tried google for it but i couldnt get to an straight awnser any enlightment is appreciated.